Medicare Advantage in Columbia County, Wisconsin
6,430 people in Columbia County, Wisconsin were enrolled in Medicare Advantage in October 2026, 43.3% of 14,847 eligible beneficiaries (−0.6 pts since October 2025). Medica Holding Company is the largest parent organization with 36% of reported enrollment; 12 parent organizations have 11 or more members and the HHI is 2,170 (highly concentrated). HRSA classifies the county as fully rural. For 2027, 535 members here are in plans that terminate or leave the county, and Sanford Health, Aspirus, Inc. leave. MA plans offered go from 42 to 31.
Parent organizations in Columbia County
| Parent organization | Members | Change since October 2025 | Share |
|---|---|---|---|
| Medica Holding Company | 2,308 | +45 | 36.2% |
| UnitedHealth Group, Inc. | 1,372 | −16 | 21.5% |
| Humana Inc. | 1,042 | +111 | 16.3% |
| University of Wisconsin Hospitals and Clincs Autho | 581 | −55 | 9.1% |
| CVS Health Corporation | 297 | +62 | 4.7% |
| Sanford Health | 192 | +16 | 3.0% |
| Elevance Health, Inc. | 189 | −193 | 3.0% |
| Molina Healthcare, Inc. | 140 | +8 | 2.2% |
| Centene Corporation | 133 | +51 | 2.1% |
| Aspirus, Inc. | 82 | +33 | 1.3% |
| Highmark Health | 26 | 0 | 0.4% |
| Network Health, Inc. | 20 | +6 | 0.3% |
CMS suppresses county and contract counts of 10 or fewer; shares are of reported enrollment.
Value-based care alongside MA
In PY 2024, 2,040 beneficiaries in Columbia County were assigned to 34 Medicare Shared Savings Program ACOs, 34.6% of assignable Original Medicare beneficiaries. Together, roughly 63% of all Medicare beneficiaries in the county are in Medicare Advantage or an MSSP ACO. See the ACOs in the MSSP Explorer.